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Xu X, Liang Y, Zheng Z, Lin Q, Cai Q, Liu R, Wang B, Wan J, Chen J, Xu C, Liao M, Zhang J. An enzyme-activated loop primer probe LAMP method based on a new SNP site in the group_17537 gene for rapid on-site detection of Salmonella Pullorum. Poult Sci 2025; 104:104779. [PMID: 39823835 PMCID: PMC11786731 DOI: 10.1016/j.psj.2025.104779] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2024] [Revised: 12/20/2024] [Accepted: 01/03/2025] [Indexed: 01/20/2025] Open
Abstract
Pullorum disease (PD) is a widespread disease that causes significant economic losses within the poultry industry of developing countries. An effective strategy for its prevention and control involves the implementation of decontamination procedures utilizing highly specific on-site detection techniques. In this study, a single-nucleotide polymorphism (SNP) site within the group_17537 gene of Salmonella enterica serovar Gallinarum biovars Pullorum (S. Pullorum) was found by using bioinformatics tools. The prevalence of this SNP among 165 strains of S. Pullorum was determined to exceed 96.3 %. The SNP exhibited a specificity rate greater than 99.9 %, with only 0.08 % detected among 2490 non-target Salmonella strains. It can be concluded that this SNP can be employed to distinguish S. Pullorum from other serotypes of Salmonella, specifically Salmonella enterica serovar Enteritidis (S. Enteritidis) and Salmonella enterica serovar Gallinarum biovars Gallinarum (S. Gallinarum). Additionally, an enzyme-activated loop primer probe LAMP (EALP-LAMP) was developed based on this SNP site for the detection of S. Pullorum. This method exhibited excellent specificity and reproducibility, achieving limit of detection of 53.5 copies/µL with plasmid DNA and 0.2 pg/µL with genomic DNA. Moreover, in clinical applications involving 190 chick embryo samples from poultry farms, 24 samples identified as S. Pullorum positive, aligning with results obtained through traditional isolation and quantitative real-time PCR (qPCR) methods. These fingdings highlight the significant potential of this method, which offers accurate, rapid, on-site and visual detection of S. Pullorum.
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Affiliation(s)
- Xiaozhen Xu
- National and Regional Joint Engineering Laboratory for Medicament of Zoonoses Prevention and Control, Key Laboratory of Zoonoses, Ministry of Agriculture, Key Laboratory of Zoonoses Prevention and Control of Guangdong Province, Key Laboratory of Animal Vaccine Development, Ministry of Agriculture, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
| | - Yucen Liang
- National and Regional Joint Engineering Laboratory for Medicament of Zoonoses Prevention and Control, Key Laboratory of Zoonoses, Ministry of Agriculture, Key Laboratory of Zoonoses Prevention and Control of Guangdong Province, Key Laboratory of Animal Vaccine Development, Ministry of Agriculture, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
| | - Zexin Zheng
- National and Regional Joint Engineering Laboratory for Medicament of Zoonoses Prevention and Control, Key Laboratory of Zoonoses, Ministry of Agriculture, Key Laboratory of Zoonoses Prevention and Control of Guangdong Province, Key Laboratory of Animal Vaccine Development, Ministry of Agriculture, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
| | - Qijie Lin
- National and Regional Joint Engineering Laboratory for Medicament of Zoonoses Prevention and Control, Key Laboratory of Zoonoses, Ministry of Agriculture, Key Laboratory of Zoonoses Prevention and Control of Guangdong Province, Key Laboratory of Animal Vaccine Development, Ministry of Agriculture, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
| | - Qianyi Cai
- National and Regional Joint Engineering Laboratory for Medicament of Zoonoses Prevention and Control, Key Laboratory of Zoonoses, Ministry of Agriculture, Key Laboratory of Zoonoses Prevention and Control of Guangdong Province, Key Laboratory of Animal Vaccine Development, Ministry of Agriculture, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
| | - Ruidong Liu
- National and Regional Joint Engineering Laboratory for Medicament of Zoonoses Prevention and Control, Key Laboratory of Zoonoses, Ministry of Agriculture, Key Laboratory of Zoonoses Prevention and Control of Guangdong Province, Key Laboratory of Animal Vaccine Development, Ministry of Agriculture, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
| | - Bosen Wang
- National and Regional Joint Engineering Laboratory for Medicament of Zoonoses Prevention and Control, Key Laboratory of Zoonoses, Ministry of Agriculture, Key Laboratory of Zoonoses Prevention and Control of Guangdong Province, Key Laboratory of Animal Vaccine Development, Ministry of Agriculture, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
| | - Jiaqi Wan
- National and Regional Joint Engineering Laboratory for Medicament of Zoonoses Prevention and Control, Key Laboratory of Zoonoses, Ministry of Agriculture, Key Laboratory of Zoonoses Prevention and Control of Guangdong Province, Key Laboratory of Animal Vaccine Development, Ministry of Agriculture, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
| | - Jinger Chen
- National and Regional Joint Engineering Laboratory for Medicament of Zoonoses Prevention and Control, Key Laboratory of Zoonoses, Ministry of Agriculture, Key Laboratory of Zoonoses Prevention and Control of Guangdong Province, Key Laboratory of Animal Vaccine Development, Ministry of Agriculture, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
| | - Chenggang Xu
- National and Regional Joint Engineering Laboratory for Medicament of Zoonoses Prevention and Control, Key Laboratory of Zoonoses, Ministry of Agriculture, Key Laboratory of Zoonoses Prevention and Control of Guangdong Province, Key Laboratory of Animal Vaccine Development, Ministry of Agriculture, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
| | - Ming Liao
- National and Regional Joint Engineering Laboratory for Medicament of Zoonoses Prevention and Control, Key Laboratory of Zoonoses, Ministry of Agriculture, Key Laboratory of Zoonoses Prevention and Control of Guangdong Province, Key Laboratory of Animal Vaccine Development, Ministry of Agriculture, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China; School of Resources and Environmental, Zhongkai College of Agricultural Engineering, Guangxin Road No. 388, Baiyun District, Guangzhou 510550, Guangdong, China
| | - Jianmin Zhang
- National and Regional Joint Engineering Laboratory for Medicament of Zoonoses Prevention and Control, Key Laboratory of Zoonoses, Ministry of Agriculture, Key Laboratory of Zoonoses Prevention and Control of Guangdong Province, Key Laboratory of Animal Vaccine Development, Ministry of Agriculture, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China.
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Comparative study of Pd@Pt nanozyme improved colorimetric N-ELISA for the paper-output portable detection of Staphylococcus aureus. Talanta 2022; 247:123503. [DOI: 10.1016/j.talanta.2022.123503] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2022] [Revised: 04/19/2022] [Accepted: 04/22/2022] [Indexed: 11/20/2022]
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3
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Li J, Li S, Wang X, Zhu Z, Zhang Q, Liu S, Wang Y, Huang J. Responsive Cysteine-Lighted Silver Nanoclusters Regulated by Highly Catalytic G-Quadruplex DNAzyme for Ultrasensitive Detection of Salmonella Typhimurium. FOOD ANAL METHOD 2022. [DOI: 10.1007/s12161-022-02300-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Mahari S, Gandhi S. Electrochemical immunosensor for detection of avian Salmonellosis based on electroactive reduced graphene oxide (rGO) modified electrode. Bioelectrochemistry 2022; 144:108036. [PMID: 34906818 DOI: 10.1016/j.bioelechem.2021.108036] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Revised: 11/26/2021] [Accepted: 12/06/2021] [Indexed: 01/27/2023]
Abstract
A novel reduced graphene oxide based (rGO) fluorine doped tin oxide (FTO) electrode was fabricated to explore the interaction of Salmonella serovars (Salmonella gallinarum, and Salmonella pullorum) with specific antibodies. Reduced graphene oxide (rGO) was labelled with S. gal and S. pul-Ab via carbodiimide activation. The biophysical characterization of fabricated electrode was done by Fourier-transform infrared spectroscopy (FT-IR), Raman Spectroscopy, X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Energy Dispersive X-Ray Analysis (EDX), cyclic voltammetry (CV), and differential pulse voltammetry (DPV), and electrochemical impedance spectroscopy (EIS). The optimization of fabricated electrode was done for various physico-chemical parameters. Under optimum conditions, the immunosensor exhibited a linear detection range (1- 1 × 105 cells) with 37 and 25 viable cells of S. gal and S. pul, respectively. The developed FTO/rGO/S.gal or S.pul-Ab/Ag immunosensor successfully detected S. gal or S. pul up to 51 and 37 cells, respectively in faecal samples and 218 and 173 cells, respectively in meat samples. FTO/rGO/S.gal or S.pul-Ab/Ag immunosensor revealed satisfactory response, and exhibited relatively low detection limit along with reproducibility. The proposed sensing model can be used as an alternative quantitative tool for the rapid and sensitive detection of Salmonellosis in meat and faecal samples.
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Affiliation(s)
- Subhasis Mahari
- DBT - National Institute of Animal Biotechnology (NIAB), Hyderabad 500032, Telangana, India; DBT-Regional Centre for Biotechnology (RCB), Faridabad 121001, Haryana, India
| | - Sonu Gandhi
- DBT - National Institute of Animal Biotechnology (NIAB), Hyderabad 500032, Telangana, India; DBT-Regional Centre for Biotechnology (RCB), Faridabad 121001, Haryana, India.
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DNAzyme-controlled plasmonic coupling for SERS-based determination of Salmonella typhimurium using hybridization chain reaction self-assembled G-quadruplex. Mikrochim Acta 2022; 189:140. [PMID: 35275270 DOI: 10.1007/s00604-021-05154-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2021] [Accepted: 12/19/2021] [Indexed: 10/18/2022]
Abstract
A facile and rapid SERS strategy for S. typhimurium detection based on hybridization chain reaction (HCR) self-assembled G-quadruplex DNAzyme (GQH DNAzyme)-controlled plasmonic coupling was developed. GQH DNAzyme is introduced as a biocatalyst to catalyze the oxidation of L-cysteines to cysteines (thiols to disulfides) to assist SERS signal transduction. This is the first time that the self-assembled split GQH DNAzyme-controlled plasmonic coupling is integrated with SERS sensing. The results reveal the proposed SERS strategy can quantify S. typhimurium with a wide linear range (5 to 105 cfu mL-1) and a low detection limit (4 cfu mL-1; n = 5, mean ± standard deviation) and RSD of 7%. The method exhibited preeminent detection performance in spiked samples with recoveries of 93.1-117%. The proposed strategy has great potential for being a versatile SERS platform for detecting a wide spectrum of analytes by replacing them with the corresponding recognition elements. Therefore, this study not only creates a practical platform for pathogenic bacteria identification and related food safety testing and environmental monitoring, but also provides a new paradigm for building SERS sensor. A facile and rapid SERS strategy for S. Typhimurium detection based on hybridization chain reaction (HCR) self-assembled G-quadruplex DNAzyme-controlled plasmonic coupling.
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Sheikhzadeh E, Beni V, Zourob M. Nanomaterial application in bio/sensors for the detection of infectious diseases. Talanta 2021; 230:122026. [PMID: 33934756 PMCID: PMC7854185 DOI: 10.1016/j.talanta.2020.122026] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2020] [Revised: 12/14/2020] [Accepted: 12/15/2020] [Indexed: 02/07/2023]
Abstract
Infectious diseases are a potential risk for public health and the global economy. Fast and accurate detection of the pathogens that cause these infections is important to avoid the transmission of the diseases. Conventional methods for the detection of these microorganisms are time-consuming, costly, and not applicable for on-site monitoring. Biosensors can provide a fast, reliable, and point of care diagnostic. Nanomaterials, due to their outstanding electrical, chemical, and optical features, have become key players in the area of biosensors. This review will cover different nanomaterials that employed in electrochemical, optical, and instrumental biosensors for infectious disease diagnosis and how these contributed to enhancing the sensitivity and rapidity of the various sensing platforms. Examples of nanomaterial synthesis methods as well as a comprehensive description of their properties are explained. Moreover, when available, comparative data, in the presence and absence of the nanomaterials, have been reported to further highlight how the usage of nanomaterials enhances the performances of the sensor.
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Affiliation(s)
- Elham Sheikhzadeh
- Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran,Corresponding author
| | - Valerio Beni
- Digital Systems, Department Smart Hardware, Unit Bio–& Organic Electronics, RISE Acreo, Research Institutes of Sweden, Norrkoping, 60221, Sweden
| | - Mohammed Zourob
- Department of Chemistry, Alfaisal University, Al Zahrawi Street, Al Maather, Al Takhassusi Road, Riyadh, 11533, Saudi Arabia,King Faisal Specialist Hospital and Research Center, Zahrawi Street, Al Maather, Riyadh, 12713, Saudi Arabia,Corresponding author. Department of Chemistry, Alfaisal University, Al Zahrawi Street, Al Maather, Al Takhassusi Road, Riyadh, 11533, Saudi Arabia
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7
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Shen Y, Xu L, Li Y. Biosensors for rapid detection of Salmonella in food: A review. Compr Rev Food Sci Food Saf 2020; 20:149-197. [PMID: 33443806 DOI: 10.1111/1541-4337.12662] [Citation(s) in RCA: 106] [Impact Index Per Article: 21.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2020] [Revised: 09/04/2020] [Accepted: 10/01/2020] [Indexed: 12/13/2022]
Abstract
Salmonella is one of the main causes of foodborne infectious diseases, posing a serious threat to public health. It can enter the food supply chain at various stages of production, processing, distribution, and marketing. High prevalence of Salmonella necessitates efficient and effective approaches for its identification, detection, and monitoring at an early stage. Because conventional methods based on plate counting and real-time polymerase chain reaction are time-consuming and laborious, novel rapid detection methods are urgently needed for in-field and on-line applications. Biosensors provide many advantages over conventional laboratory assays in terms of sensitivity, specificity, and accuracy, and show superiority in rapid response and potential portability. They are now recognized as promising alternative tools and one of the most on-site applicable and end user-accessible methods for rapid detection. In recent years, we have witnessed a flourishing of studies in the development of robust and elaborate biosensors for detection of Salmonella in food. This review aims to provide a comprehensive overview on Salmonella biosensors by highlighting different signal-transducing mechanisms (optical, electrochemical, piezoelectric, etc.) and critically analyzing its recent trends, particularly in combination with nanomaterials, microfluidics, portable instruments, and smartphones. Furthermore, current challenges are emphasized and future perspectives are discussed.
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Affiliation(s)
- Yafang Shen
- College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou, China.,Department of Biological and Agricultural Engineering, University of Arkansas, Fayetteville, Arkansas
| | - Lizhou Xu
- Department of Materials, Imperial College London, London, UK
| | - Yanbin Li
- Department of Biological and Agricultural Engineering, University of Arkansas, Fayetteville, Arkansas
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Lai W, Guo J, Wu Q, Chen Y, Cai Q, Wu L, Wang S, Song J, Tang D. A novel colorimetric immunoassay based on enzyme-regulated instant generation of Turnbull's blue for the sensitive determination of ochratoxin A. Analyst 2020; 145:2420-2424. [DOI: 10.1039/c9an02447f] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
The aim of this study was to develop a novel colorimetric sensing method based on enzyme-regulated instant generation of Turnbull's blue, serving as a chromogenic agent, for a sensitive immunoassay for the determination of ochratoxin A (OTA).
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Affiliation(s)
- Wenqiang Lai
- Key Laboratory of Modern Analytical Science and Separation Technology
- College of Chemistry
- Chemical Engineering and Environment
- Minnan Normal University
- Zhangzhou 363000
| | - Jiaqing Guo
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province
- College of Physics and Optoelectronic Engineering
- Shenzhen University
- Shenzhen 518060
- P R China
| | - Qingqing Wu
- Key Laboratory of Modern Analytical Science and Separation Technology
- College of Chemistry
- Chemical Engineering and Environment
- Minnan Normal University
- Zhangzhou 363000
| | - Yaomin Chen
- Key Laboratory of Modern Analytical Science and Separation Technology
- College of Chemistry
- Chemical Engineering and Environment
- Minnan Normal University
- Zhangzhou 363000
| | - Quanying Cai
- Key Laboratory of Modern Analytical Science and Separation Technology
- College of Chemistry
- Chemical Engineering and Environment
- Minnan Normal University
- Zhangzhou 363000
| | - Luxi Wu
- Key Laboratory of Modern Analytical Science and Separation Technology
- College of Chemistry
- Chemical Engineering and Environment
- Minnan Normal University
- Zhangzhou 363000
| | - Shuhan Wang
- Key Laboratory of Modern Analytical Science and Separation Technology
- College of Chemistry
- Chemical Engineering and Environment
- Minnan Normal University
- Zhangzhou 363000
| | - Jun Song
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province
- College of Physics and Optoelectronic Engineering
- Shenzhen University
- Shenzhen 518060
- P R China
| | - Dianping Tang
- Key Laboratory of Analysis and Detection for Food Safety (Ministry of Education & Fujian Province)
- Institute of Nanomedicine and Nanobiosensing
- Department of Chemistry
- Fuzhou University
- Fuzhou 350108
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9
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Electrochemical immunoassay for the tumor marker CD25 by coupling magnetic sphere-based enrichment and DNA based signal amplification. Mikrochim Acta 2019; 186:352. [DOI: 10.1007/s00604-019-3455-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2019] [Accepted: 04/17/2019] [Indexed: 10/26/2022]
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10
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Leng X, Wang Y, Li R, Liu S, Yao J, Pei Q, Cui X, Tu Y, Tang D, Huang J. Circular exponential amplification of photoinduced electron transfer using hairpin probes, G-quadruplex DNAzyme and silver nanocluster-labeled DNA for ultrasensitive fluorometric determination of pathogenic bacteria. Mikrochim Acta 2018; 185:168. [PMID: 29594727 DOI: 10.1007/s00604-018-2698-5] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2017] [Accepted: 01/20/2018] [Indexed: 01/17/2023]
Abstract
The authors describe a fluorometric strategy for the detection of pathogenic bacteria with ultrasensitivity and high specificity. This strategy relies on the combination of target-modulated photoinduced electron transfer (PET) between G-quadruplex DNAzyme and DNA (labeled with silver nanoclusters) along with hairpin probe-based circular exponential amplification. The reaction system involves three hairpin probes (H1, H2 and H3). Probe H1 contains an aptamer against S. Typhimurium and the recognition sequence for nicking endonuclease. It is used to recognize S. Typhimurium and participates in polymerase-catalyzed target recycle amplification and secondary-target recycle amplification. Probe H2 contains an aptamer against hemin and is used to form the G-quadruplex DNAzyme in the presence of hemin and potassium ion. It acts as the electron acceptor and quenches the fluorescence of the labeled DNA. Fluorescence is best measured at excitation/emission wavelengths of 567/650 nm. Probe H3 contains the template sequence for the synthesis of AgNCs and the H2-annealing sequence. Both H2 and H3 are utilized to perform a strand displacement reaction and to achieve PET between G-quadruplex DNAzyme and DNA/AgNCs. To the best of our knowledge, this is the first example of a PET between G-quadruplex DNAzyme and DNA/AgNCs coupled with circular exponential amplification. The assay has an ultra-low detection limit 8 cfu·mL-1 of S. Typhimurium. The assay is rapid, accurate, inexpensive and simple. Hence, the strategy may represent a useful platform for ultrasensitive and highly specific detection of pathogenic bacteria as encountered in food analysis and clinical diagnosis. Graphical abstract The reaction system includes three hairpin probes (H1, H2 and H3), primer probe (P), Phi 29 DNA ploymerase (Phi 29) and nicking endonuclease Nt.AlwI (Nt.AlwI). Phi 29 and Nt.AlwI -assisted signal amplification leads to the recycling of target and produces numerous single stranded-DNAs (S). Strand displacement amplification leads to photoinduced electron transfer (PET) between G-quadruplex DNAzyme and DNA/AgNCs. HAP-based circular exponential amplification of PET results in an ultrasensitive fluorometric assay.
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Affiliation(s)
- Xueqi Leng
- College of Resources and Environment, University of Jinan, Jinan, 250022, People's Republic of China
| | - Yu Wang
- College of Biological Sciences and Technology, University of Jinan, Jinan, 250022, People's Republic of China
| | - Rongguo Li
- Jinan Maternity and Child Care Hospital, Jinan, 250022, People's Republic of China
| | - Su Liu
- College of Resources and Environment, University of Jinan, Jinan, 250022, People's Republic of China.
| | - Jianzhuang Yao
- College of Biological Sciences and Technology, University of Jinan, Jinan, 250022, People's Republic of China
| | - Qianqian Pei
- Key Laboratory of Chemical Sensing & Analysis in Universities of Shandong, College of Chemistry and Chemical Engineering, University of Jinan, Jinan, 250022, People's Republic of China
| | - Xuejun Cui
- Key Laboratory of Chemical Sensing & Analysis in Universities of Shandong, College of Chemistry and Chemical Engineering, University of Jinan, Jinan, 250022, People's Republic of China
| | - Yuqin Tu
- College of Resources and Environment, University of Jinan, Jinan, 250022, People's Republic of China
| | - Dan Tang
- College of Biological Sciences and Technology, University of Jinan, Jinan, 250022, People's Republic of China
| | - Jiadong Huang
- College of Biological Sciences and Technology, University of Jinan, Jinan, 250022, People's Republic of China.,Key Laboratory of Chemical Sensing & Analysis in Universities of Shandong, College of Chemistry and Chemical Engineering, University of Jinan, Jinan, 250022, People's Republic of China
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Chinnappan R, AlAmer S, Eissa S, Rahamn AA, Abu Salah KM, Zourob M. Fluorometric graphene oxide-based detection of Salmonella enteritis using a truncated DNA aptamer. Mikrochim Acta 2017; 185:61. [PMID: 29594712 DOI: 10.1007/s00604-017-2601-9] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2017] [Accepted: 12/01/2017] [Indexed: 02/07/2023]
Abstract
The work describes a fluorescence-based study for mapping the highest affinity truncated aptamer from the full length sequence and its integration in a graphene oxide platform for the detection of Salmonella enteriditis. To identify the best truncated sequence, molecular beacons and a displacement assay design are applied. In the fluorescence displacement assay, the truncated aptamer was hybridized with fluorescein and quencher-labeled complementary sequences to form a fluorescence/quencher pair. In the presence of S. enteritidis, the aptamer dissociates from the complementary labeled oligonucleotides and thus, the fluorescein/quencher pair becomes physically separated. This leads to an increase in fluorescence intensity. One of the truncated aptamers identified has a 2-fold lower dissociation constant (3.2 nM) compared to its full length aptamer (6.3 nM). The truncated aptamer selected in this process was used to develop a fluorometric graphene oxide (GO) based assay. If fluorescein-labeled aptamer is adsorbed on GO via π stacking interaction, fluorescence is quenched. However, in the presence of target (S. enteriditis), the labeled aptamers is released from surface to form a stable complex with the bacteria and fluorescence is restored, depending on the quantity of bacteria being present. The resulting assay has an unsurpassed detection limit of 25 cfu·mL-1 in the best case. The cross reactivity to Salmonella typhimurium, Staphylococcus aureus and Escherichia coli is negligible. The assay was applied to analyze doped milk samples for and gave good recovery. Thus, we believe that the truncated aptamer/graphene oxide platform is a potential tool for the detection of S. Enteritidis. Graphical abstract Fluorescently labelled aptamer against Salmonella enteritidis was adsorbed on the surface of graphene oxide by π-stacking interaction. This results in quenching of the fluorescence of the label. Addition of Salmonella enteritidis restores fluorescence, and this effect is used for quantification of this food-borne pathogen.
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Affiliation(s)
- Raja Chinnappan
- Department of Chemistry, Alfaisal University, Al Zahrawi Street, Al Maather, Al Takhassusi Road, Riyadh, 11533, Saudi Arabia
| | - Saleh AlAmer
- Department of Chemistry, Alfaisal University, Al Zahrawi Street, Al Maather, Al Takhassusi Road, Riyadh, 11533, Saudi Arabia.,Strathclyde Institute of Pharmacy and Biomedical Science, University of Strathclyde, 161 Cathedral Street, Glasgow, G4 0RE, UK
| | - Shimaa Eissa
- Department of Chemistry, Alfaisal University, Al Zahrawi Street, Al Maather, Al Takhassusi Road, Riyadh, 11533, Saudi Arabia
| | - Anas Abdel Rahamn
- King Faisal Specialist Hospital and Research Center, Zahrawi Street, Al Maather, Riyadh, 12713, Saudi Arabia
| | - Khalid M Abu Salah
- Department of Nanomedicine, King Abdullah International Medical Research Center/King Saud bin Abdulaziz University for Health Sciences, King Abdulaziz Medical City, PO Box 3660, Riyadh, 11481, Saudi Arabia
| | - Mohammed Zourob
- Department of Chemistry, Alfaisal University, Al Zahrawi Street, Al Maather, Al Takhassusi Road, Riyadh, 11533, Saudi Arabia. .,King Faisal Specialist Hospital and Research Center, Zahrawi Street, Al Maather, Riyadh, 12713, Saudi Arabia.
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